Truss.



E. HARTWIG.

TEUSS.

APPLICATION FILED 0GT.9, 1909.

Patented Aug. 6, 1912 W mnwtoz a g iattoz neg I u mao;

UNITED STATES PATENT OFFICE.

EMIL HARTWIG, OF JERSEY CITY, NEW JERSEY, ASSIGNOR TO POMEROY COMPANY,OF NEW YORK, N. 2., A CORPORATION OF NEW YORK.

TRUSS.

To all whom it may concern;

Be it known that I, Earn, HARrwIo, a citizen of the United States, and aresident of Jersey City, county of Hudson, and State of New Jersey, haveinvented a new and useful Improvement in Trusses, of which the followingis a specification.

This invention relates to trusses and has for its object theconstruction and arrangement of the spring or frame and of the devicesor parts for connecting the pad with the spring or frame in such mannerthat the pad may be conveniently adjusted upon and secured to the frameand that the lat ter may be made of round wire, and that the advantagesof adjustment and security hereinafter pointed out and claimed may beobtained.

Referring to the accompanying drawings forming part of thisspecification, Figure 1 is a front elevation of a truss having a pad andframe constructed and connected in accordance with this invention. Fig.2 is an elevation of the means shown in Fig. 1 connecting the pad withthe frame, viewed from the side upon which the pad is secured. Fig. 3 isan elevation of the other side of said means, part thereof having beenremoved. Fig. 4 is an elevation, partly in vertical section, of saidmeans viewed from the same side as in Fig. 3. Fig. 5 is a side view,partly in section, made as indicated by the line a b in Fig. 2, of saidmeans for connecting the pad with the frame and shows part of the frame.Fig. 6 is a side View, partly in section, made at right angles to theline of the section shown in Fig. 5 and as indicated by the line 0 (Z inFig. 2, of said means for connecting the pad with the frame and shows across section of the frame. The arrows in Fig. 2 show the directions ofthe views in Figs. 5 and 6.

In the drawings like letters denote like parts.

A is the pad which is attached to the padplate B by means of screws Cpassing through holes D in the pad plate.

E is a rod secured to the pad-plate, as by rivets 6, upon the pad sideof the pad-plate.

F is an inflexible standard provided with a hole f through which the rodE passes on the pad side of the pad-plate. The standard F passes fromthe rod E through a hole Specification of Letters Patent.

Application filed October 9, 1909.

Patented Aug. 6, 1912.

Serial No. 521,967.

g with which the pad-plate is provided, preferably mid-way between itssides and a little below the point mid-way between its top and bottom,reference being had to Fig. 2 and as there indicated. The width of thehole 9 is somewhat greater than the width of the standard F so thatpoints of the standard F, which, preferably, is loosely mounted andpivoted on the rod E, are free to oscillate in planes at right angles tothe rod E. The other end of the standard F is provided, on the otherside of the padplate, with a flat, circular or disk-shaped head h, asshown in Letters-Patent No. 505,228, of September 19, 1893 to D.Pomeroy, for improvement in trusses.

The head it of the standard F rests in a recess G in the screw-plate H,which is provided with a shoulder 2' fitting part way around standard Fand extending beneath head it. The screw-plate H is revoluble aboutstandard F and the head it of the standard F can be inserted into orwithdrawn from the recess G of the screw-plate H by a lateralv movementand is revoluble therein. The shoulder 2', engaging with the head it,will prevent the withdrawal of the screwplate H from the standard F byan upward movement in the direction of the length of the standard F. Thescrew-plate H is provided with screw-holes 7c, preferably extendingtherethrough. The upper surfaces of head it and of screw-plate H are,preferably, in the same plane.

Resting upon the upper surfaces of head it and screw-plate H is theholding plate 1, preferably made of steel or other suitable hard metal,which is provided on the side away from the screw-plate H with a grooveK having sharp, parallel edges 8 for engagement with the frame L. Asshown in Fig. 6, the distance between the parallel edges 8 of the grooveK is less than the diameter or width of the cross-section of the frame Land is, preferably, about one-third thereof. The holding-plate I isprovided with holes m just above the screw-holes 7c in the screw-plateH. Preferably, the holding-plate I is provided with a tongue or eX- 1tension M on one side to act as a guide for the head it when the latteris inserted in recess Gas hereinafter explained. The screwplate H andthe holding-plate I have such relative positions that the tongue Mextends beyond the short or cut-off side of the screwplate H, as shownclearly in Fig. 4.

Surrounding and covering the screwplate H and holding-plate I is theshell N which, preferably, is in the shape of a hollow cylinder closedat the top and open at the bottom. The top of the shell N is providedwith holes 0 above the holes at in holding-plate T and the screw-holes kin the screw-plate H and is also provided with a convex portion aextending fro-m side to side between the holes 0. The shell N is,furthermore, provided on its sides with holes 39 beneatlrthe ends of theconvex portion 11,. The part a is concave on the interior side of theshell N and the uppermost points of the holes 7) are, preferably, at theends of the uppermost straight line extending from side to side alongthe top of the concavity of part a. The concavity of the part n and theholes 79 are of such shape and size that the frame L will passtherethrough and come in contact with the upper surface of the concavity of the part at. The groove K of the holding-plate T faces theconcavity of the part a and the frame L, which is preferably made ofround wire, passes in and along the groove and the concavity. Screws Ppassing through the holes 0 and m and into or through the screw-holes ishold the shell N, the holding plate I and the screw-plate H together inthe positions and relations above set forth.

Q is a band connecting the ends of the spring or frame L and R are padsaffixed to the rear of the truss.

From the foregoing description the mode of operation and the advantagesof a truss constructed in accordance with this invention will be readilyunderstood. The shell N, the holding-plate I and the screw-plate H,having been placed in their proper, relative positions as abovedescribed, are loosely secured together by means of the screws P. Thehead /L of the standard F, carrying the pad-plate B with the pad Aattached, is inserted into the recess G of the screw-plate H, the tongueM of the holding-plate I acting as a guide and aiding the insertion. Theframe L, free from the band Q, connecting its ends and from the pads Rand made, preferably, as above stated of round wire, is then, byinserting one of its ends, passed through the holes 39 in the shell Nand in and along the concavity of the part a and the groove K of theholding-plate I until any desired position, such as that shown in Fig.1, of the pad A and its connecting parts is obtained upon the frame L.Thereupon the pad A and the pad-plate B are caused to be revolved, byrevolution of the standard F within the recess G of the screwplate H,until the pad is brought into the position sought as a result of suchmovement or revolution. Simultaneously with or before or after thepreceding movement or adjustment, the points of shell N, holdingplate I,screw-plate H and pad A, and pad plate B connected therewith by standardF, may be tilted or revolved upon the frame L in planes perpendiculartothe planes in which the oscillating pad-plate B revolves when thestandard F is revolved within the recess G of the screw-plate H, asabove described. The pad having been adjusted in the manner described soas to secure the position desired or most advantageous for the purposesof the operator, the screws P are thereupon further screwed into thescrewholes 711 of the screw-plate H until the adjustable parts arebrought and locked firmly in the desired position. By such furtherinsertion of the screws P into the screw-holes k, the screw-plate H isdrawn toward the top or covered part of the shell N carrying with it thestandard F and bringing the head h of the standard F to bear tightlyupon the lower surface of the holding-plate I. At the same time theupper surface of the screw-plate H is brought into close contact withthe lower surface of the holding plate I, with the result that furtherrevolution of standard F within recess G is impossible. Thebeforementioned pressure upon the lower surface of holding-plate Iforces that plate against the frame L, whereby frame L is forced intothe concavity of the part a of the shell N and against the wall thereof.The sharp edges 8 of the groove K firmly grip that part of the frame Lwith which they come in contact and by reason thereof and of thepressure of the frame L against the wall of the concavity of the part a,no further tilting or movement of the parts mentioned in the mannerdescribed about the frame L is possible. After the screws P have beentightened as above described, the pad A and pad-plate B can move only byreason of the oscillating motion above mentioned of the standard F uponthe rod E and within the hole g, which oscillating motion may, ifdesired, be obviated in any suit-able manner, as by making the hole 9 ofsmall diameter or by making the rod E and the hole f in the standard Fsquare instead of round.

The present invention permits the use of round wire for the constructionof the frame of the truss and thereby permits of the tilting or movementof the parts upon the frame as above described in adjustment, and, atthe same time, enables the operator, after proper adjustment, firmly tolock the parts together as above pointed out. It also permits theretention, after adjustment and locking of the parts, of the oscillatingmotion of the pad, due to the oscillation of the standard F upon itspivot rod E. It also secures, in a novel manner and combination,

the other above mentioned movements of the pad in adjustment and theprevention thereof after locking of the parts.

What I claim is 1. In a truss, the combination of a padplate, ascrew-plate provided with a recess open at one side, a standardconnecting the pad-plate and screw-plate and revoluble within the recessof the screw-plate, a frame, a holding plate bearing upon the frame, ashell revoluble about the frame, and means for locking the standard,screw-plate, frame, holding-plate and shell together, forcing theholding-plate toward the frame substantially as described.

2. In a truss, the combination of a standard, provided at one end with ahead, a padplate secured to the other end of the standard, a screw-plateprovided with a recess receiving the head of the standard, the standardbeing revoluble in the recess, a frame, a holding-plate between theframe and standard bearing on one side against the head of the standardand provided on the other side with sharp edges bearing upon the frame,and means for locking the standard, screw-plate, frame, holding-plateand sharp edges securely together, substantially as described.

3. In a truss, the combination of a standard, a pad-plate secured to oneend of the standard, a screw-plate provided with a recess receiving theother end of the standard, the standard being revoluble within therecess, a frame, a holding-plate between the frame and standard bearingon one side against the standard and provided on the other side withsharp edges bearing against the frame, the holding-plate being movablealong and revoluble about the frame, and means for locking the standard,screw-plate, frame, holding-plate and sharp edges securely together,substantially as described.

EMIL HARTWIG.

Witnesses:

HARRY C. BELTZNUG, ARTHUR O. POMEROY.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. 0.

